How do I formally refer to a girl I do not respect(because she's a menace) who is late 40's early 50's? So the different terms have implications I don't care for it want to convey.
I would get creative with it, just because she's horrible doesn't mean you don't get to have a good time. "The purveyor of lies", "fount of unreason", maybe give her a nickname that relates to one of her mistakes. If you can come up with something new every time it can become like a game, even if you're only saying them in your head.